771631740 has 72 divisors (see below), whose sum is σ = 2553406128. Its totient is φ = 187061760.

The previous prime is 771631733. The next prime is 771631753. The reversal of 771631740 is 47136177.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 771631695 and 771631704.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 192877 + ... + 196836.

It is an arithmetic number, because the mean of its divisors is an integer number (35463974).

Almost surely, 2^771631740 is an apocalyptic number.

It is an amenable number.

771631740 is an abundant number, since it is smaller than the sum of its proper divisors (1781774388).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

771631740 is a wasteful number, since it uses less digits than its factorization.

771631740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389739 (or 389734 counting only the distinct ones).

The product of its (nonzero) digits is 24696, while the sum is 36.

The square root of 771631740 is about 27778.2602046996. The cubic root of 771631740 is about 917.2126331418.

The spelling of 771631740 in words is "seven hundred seventy-one million, six hundred thirty-one thousand, seven hundred forty".